The worker missing from Sleipner A since the afternoon of 22 February has still not been found.
A search around the Statoil platform in the North Sea was maintained by two standby vessels throughout the night.
Many of the 140 crew on board have taken part in the hunt on Sleipner A and T. Before darkness fell, a helicopter was also involved.
A fresh trawl of the platforms was begun by 100 people at 09.00 today (23 February). And a support ship is due to arrive at 13.00 to begin searching with two remotely-operated vehicles (ROVs).